Akemi Akenova Rocket 200 Polyhybrid Adhesive: A Spotlight

Most of the adhesive talk in a fabrication shop is about seams: knife-grade polyester, flowing epoxy, colour matching and how well the cured line takes a polish. A large share of the bonding done on an install, though, never sees a polishing pad. Sink bowls go under tops, sills go onto masonry, treads go onto concrete, backsplashes and skirting go onto walls, and build-up strips go under worktops. Those bonds are hidden, they join unlike materials, and they have to tolerate movement. The Akemi Akenova Rocket 200 Fast-Setting Polyhybrid Adhesive is a cartridge product built for exactly that class of work.

This spotlight sets out what Akemi and the Dynamic Stone Tools listing actually publish about Rocket 200: the chemistry, the working times, the strength and temperature figures, the primer rules and the stated limits. Where the listing and the manufacturer’s technical data sheet give different numbers, both are shown and the difference is pointed out. Anything described as shop practice is general trade practice, not a specification from Akemi. Read the current data sheet and safety data sheet before using the product, because the manufacturer labels it for professional use only.

What a One-Component Polyhybrid Adhesive Is

Akemi describes Akenova Rocket 200 as a moisture-curing, stress-compensating, one-component adhesive based on polyhybrid technology; the manufacturer’s product page lists the adhesive technology as MS-polymer. One component means there is no hardener to measure and no mixing nozzle to purge. The paste comes out of the cartridge ready to use and begins to react when it meets moisture, both from the air and from the surfaces being joined. That single fact explains most of the handling rules later in this article, including why bead layout and joint thickness affect how fast the bond cures through.

The second point that matters to stone people is what the product does not contain. Akemi and the store listing both state that Rocket 200 is free of silicone, isocyanate, tin, solvents and VOCs, and the data sheet describes it as almost odourless. The data sheet also says that, because the adhesive is free of plasticisers and solvents, it does not cause edge-zone discolouration on natural stone.

Rocket 200 is also not a seam adhesive, and the published application text is explicit about it. Akemi describes the use as stress-compensating bonding of non-polishable joints in natural and artificial stone. The cured material is an elastic, rubbery solid with a published final hardness of approximately 90 Shore A, so it will not grind and polish to a glassy line the way a rigid polyester or epoxy does. It belongs behind, under and between parts, where its job is to hold and to flex, and where nobody will ever put a pad on it.

Where Rocket 200 Fits on a Stone Job

The listing and Akemi’s own material name the same group of jobs: fast fixing of sinks, window sills, stair treads, skirting boards and mirrors, and attaching substructures to kitchen worktops. The stone types named in the listing are granite, quartzite, sandstone and terrazzo, plus SPC, bonded to mineral, metal and wood surfaces. Akemi’s product page gives a wider list of materials that also includes marble, limestone, quartz, ceramics, concrete, glass, metal, wood, PVC and acrylic, with the primer rules covered below applying to several of them when moisture is involved.

Orientation is not restricted. Both sources state that Rocket 200 is suitable for vertical and horizontal bonds and for indoor and outdoor use, and the data sheet says it is resistant to UV, moisture and weathering. The manufacturer also states that underwater bonding is possible because of the adhesive’s low water absorption, and the Akenova flyer gives swimming pool areas as the example. The high initial tack matters too: Akemi says it makes bonding large components such as mirrors easier, and the listing describes quick fixing without clamping.

Published Specifications and Working Times

The values below are taken from the Dynamic Stone Tools listing and from Akemi’s technical data sheet and product page for Akenova Rocket 200. They are the manufacturer’s laboratory figures, and Akemi notes that skin-formation time depends on air humidity, the moisture content of the parts and the ambient and component temperatures. Treat them as planning numbers, not guarantees for a cold garage or a hot, damp jobsite.

Reading the Initial Tack Figures

The one place where the published sources differ is initial tack. The store listing and Akemi’s current product page give a high-tack value of about 450 kg/m², with the product page wording it as more than 450. The German-language technical data sheet dated 04.23 lists initial strength as approximately 200 kg/m², and the Akenova flyer also quotes a figure above 200. The sensible reading is that the manufacturer has published both at different times; the article shows both, and the conservative habit is to plan heavy vertical parts around the lower number.

Whichever figure applies, remember what the unit means. Kilograms per square metre is a load spread over a fully wetted bond area, and beads never cover the whole back of a part. A narrow strip with two thin beads has a small real contact area, and a heavy part on a wall still deserves a ledge, a setting block or a temporary support until the adhesive has developed strength. The published figure describes the adhesive; it does not describe the bond geometry on a particular job.

Open Time, Skin Time and Handling Time

Three time values control the work. Akemi instructs the user to join the parts within 10 minutes of applying the adhesive. Skin formation is published as 10–15 minutes, and once a skin has formed on the bead the adhesive will no longer wet the second surface properly. Handling strength is published at approximately 20 minutes. Those numbers are close together, so work one part at a time: dry fit, clean, apply and set. Akemi’s application window of +5°C to +35°C, which is 41°F to 95°F, applies to the parts as well as the air.

Cure Depth and Bead Layout

Handling strength is not full cure. A moisture-curing adhesive hardens from the exposed surface inward, and Akemi publishes the rate as roughly 1.5–2 mm in the first day, with approximately 2 mm after 24 hours at 20°C and 50% relative humidity. The data sheet warns that thick layers can strongly delay curing through. A fat bead squeezed between two slabs has only its edges exposed to air, so the centre of that bead depends on moisture travelling in from the sides or out of the substrates.

For that reason the manufacturer’s instruction for larger areas is specific: apply beads of the required thickness parallel to each other and space them so that they do not merge into a continuous layer when the part is pressed down, because a closed layer strongly delays through-curing. Parallel beads with open channels between them let air and moisture reach more of the adhesive. For the same reason, covering the whole back of a tread or a sill with a trowelled film is the wrong way to use this product.

Akemi adds a point that surprises people used to keeping everything dry. With thin joints, with vapour-tight materials such as metal, ceramic and glass, or where little adhesive surface is exposed, the data sheet says to moisten the bonding surfaces shortly before joining; otherwise complete curing can take several weeks. A light misting is the intent, not standing water. A stainless sink flange against a dense granite underside is a typical example of two vapour-tight faces with very little exposed edge.

Surface Preparation and the Primer Table

Preparation is short but not optional. Akemi requires contact surfaces to be clean and free of grease and dust. The data sheet names AKEMI Cleaner A for natural and artificial stone, tiles, ceramic, glass, unpainted wood and metals, and AKEMI Cleaner I for plastics and painted surfaces. On a fabrication job the usual contaminants are slurry film from wet cutting, sealer or impregnator on the underside of a top, release agents on new sink bowls and plain shop dust. Every one of those sits between the adhesive and the surface it is supposed to grip.

The listing summarises the primer rule in one sentence: silicate surfaces such as granite, concrete and glass bond without primer, while non-silicate or moisture-loaded substrates require an AKEMI primer. Akemi’s data sheet is more detailed. Its primer table lists no primer for any of the named substrates when the bond is not exposed to moisture. With moisture exposure, silicate stone such as granite and sandstone, sintered ceramic, glass, tile and porcelain stoneware still need no primer, but other substrates are each assigned a specific AKEMI primer.

According to that table, bonds exposed to moisture call for primer AP 10 on limestone and on quartz composite, AP 70 on marble and on concrete, AP 30 on solid surface and acrylic glass, and AP 20 on metals including bare and galvanised iron, bare and anodised aluminium, brass and stainless steel. Note that the listing mentions concrete among the silicate surfaces bonded without primer while the data sheet table assigns AP 70 to concrete under moisture exposure; where the two differ, the data sheet is the document to follow for wet service.

For a countertop shop the stainless steel line is the one to read twice. An undermount sink bond lives beside water for its whole life, and the manufacturer’s table calls for AP 20 on stainless steel with moisture exposure. Quartz composite with moisture exposure calls for AP 10. Whether a given sink bond counts as moisture-exposed is a judgement the installer has to make, and the cautious reading is that a sink rim does. Mechanical sink supports remain normal trade practice alongside any adhesive.

Akemi also lists materials where the product is the wrong choice or needs testing. Adhesion is described as absent or limited on plastics containing plasticisers and on PE, PP and PTFE, and a preliminary test is required. The data sheet further tells the user to confirm compatibility with the materials being bonded and with neighbouring materials, and to check that sealants, paints, coatings, other adhesives and cleaners used nearby afterwards do not discolour or damage the adhesive.

Application Technique and Trade Tips

The data sheet’s note on tools is short: use professional guns with a high gear ratio. Rocket 200 is a stiff, paste-like material by design, since that body is part of what stops a vertical part sliding, and a light-duty skeleton gun makes for an uneven bead and a tired hand. Akemi’s product page lists its own hand gun and a range of nozzles as accessories. Dynamic Stone Tools groups guns with sealants in its caulking guns and silicone category, which is the place to look for a gun suited to heavy-bodied cartridges.

Seat the part with a firm press and a slight sliding motion to wet both faces, then bring it to its marks and leave it alone. Repeated lifting and re-seating after the skin has started to form breaks the fresh bond and traps air. Where the joint edge is visible, Akemi’s instruction is to smooth it with the company’s smoothing agent. Uncured squeeze-out is removed with Cleaner A or Cleaner I depending on the substrate; the data sheet states that cured adhesive can only be removed mechanically, so clean as you go.

Storage, Shelf Life and Service Limits

Akemi’s storage instruction is to keep cartridges dry and cool, at 5–25°C, in the unopened original container, with a shelf life of at least 18 months from production; the listing gives 18 months and the Akenova flyer states the same period at 20°C. A moisture-curing adhesive is used up by humid air, so an install truck in summer is a poor long-term store. Rotate stock, check dates when a case arrives and keep the working supply indoors. In service the published range is -25°C to +80°C, with short-term resistance to 120°C, and Akemi warns that temperatures above 80°C can discolour the adhesive surface.

Low emissions are part of the published profile. The adhesive carries the GEV EMICODE EC 1 classification for very low emissions, and Akemi states that emission class A+ was confirmed by an external testing institute. For installers working in occupied homes, and for projects where the specifier asks for documentation on interior air quality, that is a practical reason to choose it over solvent-bearing alternatives. Because cured adhesive can only be removed mechanically, a bonded sink or sill that ever needs replacing will have to be cut out, so plan bead positions with future access in mind.

Related Adhesives and Supplies at Dynamic Stone Tools

For hidden, flexible, stone-to-substrate bonds, the Akenova Rocket 200 in the 290 mL cartridge sits alongside the rest of the Akemi range and the wider selection of cartridge adhesives. The same brand family includes the Akemi Akenova Tiger Grip 50 Adhesive and the Akemi Akenova Crystal Clear Adhesive Sealant, each with its own data sheet and its own job. For polishable seams and laminations, look instead at rigid seam adhesives; an elastic polyhybrid is the wrong tool there.